Import newlib and create makefile

1 files changed, 127 insertions, 0 deletions

diff --git a/newlib/libc/sys/sysvi386/crt0.c b/newlib/libc/sys/sysvi386/crt0.c
new file mode 100644
index 0000000..7949b3d
--- /dev/null
+++ b/newlib/libc/sys/sysvi386/crt0.c
@@ -0,0 +1,127 @@
+/*-
+ * Copyright (c) 1990 The Regents of the University of California.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *	This product includes software developed by the University of
+ *	California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#ifndef lint
+static char sccsid[] = "@(#)crt0.c	5.7 (Berkeley) 7/3/91";
+#endif /* not lint */
+
+/*
+ *	C start up routine.
+ *	Robert Henry, UCB, 20 Oct 81
+ *
+ *	We make the following (true) assumption:
+ *	1) The only register variable that we can trust is ebp,
+ *	which points to the base of the kernel calling frame.
+ */
+
+char **environ = (char **)0;
+static int fd;
+
+/*
+asm(".text");
+asm(".long 0xc000c000");
+*/
+extern	unsigned char	etext;
+extern	unsigned char	eprol asm ("eprol");
+/* extern			start() asm("start"); */
+
+_start(int arg)
+{
+	struct kframe {
+		int	kargc;
+		char	*kargv[1];	/* size depends on kargc */
+		char	kargstr[1];	/* size varies */
+		char	kenvstr[1];	/* size varies */
+	};
+	/*
+	 *	ALL REGISTER VARIABLES!!!
+	 */
+	register struct kframe *kfp;	/* r10 */
+	register char **targv;
+	register char **argv;
+	extern int errno;
+	extern void _mcleanup();
+
+#ifdef lint
+	kfp = 0;
+	initcode = initcode = 0;
+#else not lint
+# if 0
+	asm("lea 4(%ebp),%ebx");	/* catch it quick */
+# else
+	kfp = (struct kframe *)&(((int *)(&arg))[-1]);
+# endif
+#endif not lint
+	for (argv = targv = &kfp->kargv[0]; *targv++; /* void */)
+		/* void */ ;
+	if (targv >= (char **)(*argv))
+		--targv;
+	environ = targv;
+asm("eprol:");
+
+#ifdef paranoid
+	/*
+	 * The standard I/O library assumes that file descriptors 0, 1, and 2
+	 * are open. If one of these descriptors is closed prior to the start 
+	 * of the process, I/O gets very confused. To avoid this problem, we
+	 * insure that the first three file descriptors are open before calling
+	 * main(). Normally this is undefined, as it adds two unnecessary
+	 * system calls.
+	 */
+	do	{
+		fd = open("/dev/null", 2);
+	} while (fd >= 0 && fd < 3);
+	close(fd);
+#endif paranoid
+
+#ifdef MCRT0
+	atexit(_mcleanup);
+	monstartup(&eprol, &etext);
+#endif MCRT0
+	errno = 0;
+	exit(main(kfp->kargc, argv, environ));
+}
+
+#ifdef CRT0
+/*
+ * null mcount and moncontrol,
+ * just in case some routine is compiled for profiling
+ */
+moncontrol(val)
+	int val;
+{
+
+}
+asm(".globl mcount");
+asm("mcount: ret");
+#endif CRT0